Hello, new guy here, i am working on a 1956 buick special 4 door post car. The speedometer works fine but the odometer does not change. Just looking for some help. Also, when in reverse, (its an automatic) it might jump out of reverse. Thanks !
Speedo has to come out. More than likely the gear fell out of place.
Try a linkage adjustment 1st. If you don't have one get a CHASSIS MANUAL.
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